Transit-frame.



A. LIETZ.

TRANSIT FRAME.

APPLICATION FILED JAN- 22. 1913.

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ADOLPH LIETZ, OF SAN RAFAEL, CALIFORNIA.

TRANSIT-FRAME.

Application filed January 22, 1913.

To all whom it may concern.-

Be it known that I, AnoLrrr Linrz a citi-,

for the purpose of giving stability thereto and preventing thedeflection of the telescope from the line of collimation; second, toprovide means for adjusting the rigid axis and maintaining the same in ahorizontal position; third, to provide means for securing a lateraladjustment of the telescope; and fourth, to provide a continuous rigidaxis for the support. of the telescope that will not interfere with theline of collimation through the center of the said telescope in anyoperating position in which the said telescope may be placed. Iaccomplish these several features by means of the device illustrated inthe drawings forming a part of this specification wherein like numeralsof reference refer to similar parts throughout the said specificationand drawings and in which Figure 1 is a broken sectional view of theupper portion of a transit showing the improved manner in which Ipropose to rotatably secure the telescope on a rigid axis and the mannerin which the said axis is rigidly secured to the upper ends of thesupporting standards. Fig. 2 is a broken side view of the upper portionof one of the standards disclosing the manner in which the horizontalposition of the rigid axis is adjusted and secured. Fig. 3 is a sideelevation of the upper portion of a transit with the near standardremoved and the rigid axis shown in section through the aperture thereinand the horizontal position of the telescope in full lines, the dottedlines disclosing extreme operating angles in which the telescope may beplaced. Fig. 4 is an enlarged sectional view of the rigid axis showingthe manner in which the same is secured to the standards and the mannerin which the telescope trunnions are rotatably mounted upon the rigidaxis.

Specification of Letters Patent.

Patented Apr. 20, 1915. Serial No. 743,622.

The numeral 1 is used to designate the top plate of a transit and 2 theparallel vertical standards in the upper ends of which is rigidlysecured the axis 3 having a central apertured portion 4. The axis 3 isprovided at one end with a reduced cylindrical portion 5 and a reducedflattened portion 6 at the other end thereof. The reduced portion 5 ofthe axis 3 is adapted to enter a circular aperture at the upper end ofone of the standards 2 while the other standard 2 is provided at itsupper end with a slot 2' for the engagement and retention of theflattened portion 6 of the said axis 3 so that the apertured portion 4thereof will always be retained in a vertical position relative to thetop plate 1. The upper portion of the standard 2 containing the slot 2is further provided with upper and lower vertical adjusting screws 16and 17, respectively, which enter the slot and engage the reducedflattened portion 6 of the axis 3. By means of these screws 16 and 17the end of the axis 3 adjacent thereto is adjusted to and maintained ina position that is relatively horizontal to the top plate 1. The axis 3is rigidly secured to the standards 2 by means of the end screws 7,which bear against the washers 7 and draw the upper portions of the saidstandards tightly against the shoulders between the reduced portions 5and 6 respectively and the full diameter of the axis 3. In this mannerthe rigidity of the standards 2 and the axis 3 is secured.

The outer ends of the axis 3 are further provided with threaded portions8 which engage the internally threaded collars 9 rotatably mountedthereon. Sleeves 10, having cone faces 11, are also provided at each endof the axis 3 and are feathered thereto by means of the feathers 18 sothat while the said sleeves 10 are capable of longitudinal movement onthe said axis 3, they are incapable of rotation thereon. The cone facesor bearing portions 11 of the sleeves 10 are adapted to engage andsupport similar internal faces 12 within the hollow trunnions 14 of thetelescope 15. After the trunnions 14 of the telescope 15 have beenrotatably mounted upon the bearing surfaces 11 of the sleeves 10, theinternally threaded collars 9 are turned upon the threaded portions 8 ofthe axis 3, thereby moving the sleeves 10 and the trunnions 14 rotatablymounted thereon, until the telescope 15 is placed directly over thevertical axis of the instrument. In this manner the lateral adjustmentof the central line of collimation within the telescope is obtained andsecured.

The aperture within the central piece 4 of the axis 3 is obtained by theintersection of two holes bored or drilled therethrough so that whilethe telescope is in the position indicated by the dotted lines BB orJ-C, Fig. 3 of the drawings, as indicated by the aforesaid dotted lines,the line of collimation has an uninterrupted path, the same as in thehorizontal position indicated in full lines wherein the central dottedline A-A represents the line of collimation in that position.

It is obvious from the foregoing that I have provided a rigid,continuous axis for the support of the telescope, that will notinterfere with the line of collimation therethrough in any operatingposition in which the said telescope may be placed. I have also providedmeans for increasing the rigidity of the supporting standards fortransits, means adapted to adjust the telescope to a horizontal positionrelatively to the top plate on which the said telescope is mountedandalso means for adjusting and maintaining the telescope laterally or to aposition directly over the center of the vertical axis of theinstrument.

The details of construction being so susceptible to change I do not wishto confine myself to the precise method shown herein, but rather toavail myself of any modification that may fall properly within the scopeof my invention.

Having thus described my invention what I claim as new and desire tosecure by Let ters Patent is 1. A transit frame comprising a suitport atelescope rotatably mounted thereon;

and means for vertically adusting one end of the apertured axis.

3. A transit frame comprising a suitable top plate having parallel,vertical standards Copies of this patent may be obtained for five centseach. by addressing the Commissioner of Patents,

integral therewith; a centrally apertured axis rigidly secured to and Vuniting the upper ends of the standards; suitable cone bearings slidablymounted upon either end of the axis and adapted to engage and supportthe trunnions of a telescope; and vertical screws secured to the top ofone of the standards and adapted to raise and lower one end of the rigidaxis.

41. A transit frame comprising a suitable top plate; vertical, parallelstandards in tegral with the base plate and having a circular aperturein the upper portion of one standard and a vertical slot in the otherstandard; a centrally apertured axis having a cylindrical reducedportion at one end adapted to engage the circular aperture in onestandard and a. flattened reduced portion at the other end thereofadapted to engage the slot in the other standard; vertical screwsprojecting into either end of the vertical slot and adapted to engagethe flattened, reduced portion of the axis there in; suitable conebearings slidably mounted upon either end of the apertured axis andbetween the standards to which the axis is secured; and means foradjustingthe distance between the cone bearings.

5. In a transit frame the combination of a suitable top plate; vertical,parallel standards integral with the base plate and having acircularaperture in the upper portion of one standard and a verticalslot in theupper portion of the other standard; an axis having acylindrical reduced portion at one end and a flattened reduced portionat the other end thereof and an enlarged central piece with a centralaperture produced by boring two intersecting holes whose axes interceptthe center of the rigid axis; vertical screws projecting through theupper; and lower ends of the vertical slotin one standardand adapted toengage the flattened reduced portion of the axis thereof; suitable conebearings feathered to either end of the axis and between the standardsto which the axis is secured; and collars threaded on either end of theaxis and adapted to move the cone bearings longitudinally upon thesaidaxis.

In witness whereof I hereunto set my signature in the presence of twosubscribing Washington, D. 1.

